cnn state of the union at 3:00 and face the nation from cbs. listen to them all on c-span radio 91 fm. xm satellite channel 119. listen on your i-phone, blackberry or android. on c-span.org. truman had two big puzzles in his life. first was, this is a man that got in politics having failed in many businesses as a young man. and the only way to get in politics in missouri was to be part of a machine. there were two of them and he looked up with the pender gast machine arguably the most corrupt and often vicious machine. i said how did this happen? how could he work in this machine in local politics? that was the first thing i had to work out. the second of course is what we all know about and that is how did he come to use the atomic bomb? what was behind the decision? what's the story about the atomic bomb before he became president? and then when the decision was on his desk. it's still a controversial story and i wanted to know more about it. >> from his early life through his presidency. we look at the life of harry truman in, citizen soldie